Error: feature not enabled on current Vault version. min version required=1.15.0

I am seeing this error when trying to deploy SAML to enterprise vault with Terraform. Our vault cluster is at 1.15.5, yet terraform is unable to determine the version and spits out this error.

terraform.exe apply

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # vault_saml_auth_backend.main will be created
  + resource "vault_saml_auth_backend" "main" {
      + acs_urls         = [
          + "<redacted>=Vault",
          + "https://<redacted>:8200/auth/saml/callback",
          + "https://<redacted>POC/auth/saml/callback",
        ]
      + default_role     = "admin"
      + disable_remount  = false
      + entity_id        = "<redacted>"
      + id               = (known after apply)
      + idp_metadata_url = "<redacted>xml"
      + path             = "saml-mfa"
      + verbose_logging  = false
    }

  # vault_saml_auth_backend_role.role will be created
  + resource "vault_saml_auth_backend_role" "role" {
      + bound_attributes      = {
          + "group" = "admin"
        }
      + bound_attributes_type = (known after apply)
      + bound_subjects        = [
          + "*<redacted>",
        ]
      + bound_subjects_type   = "glob"
      + groups_attribute      = "groups"
      + id                    = (known after apply)
      + name                  = "admin"
      + path                  = "saml-mfa"
      + token_policies        = [
          + "operator",
        ]
      + token_ttl             = 86400
      + token_type            = "default"
    }

Plan: 2 to add, 0 to change, 0 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

vault_saml_auth_backend.main: Creating...
╷
│ Error: feature not enabled on current Vault version. min version required=1.15.0; current vault version=<nil>
│
│   with vault_saml_auth_backend.main,
│   on main.tf line 8, in resource "vault_saml_auth_backend" "main":
│    8: resource "vault_saml_auth_backend" "main" {
│
╵

$ vault status
Key             Value
---             -----
Seal Type       shamir
Initialized     true
Sealed          false
Total Shares    5
Threshold       3
Version         1.15.5+ent.hsm.fips1402
Build Date      2024-01-26T21:04:45Z
Storage Type    consul
Cluster Name    vault-cluster-bd81fe48
Cluster ID      <redacted>
HA Enabled      true
HA Cluster      <redacted>
HA Mode         active
Active Since    2024-02-15T16:18:31.634183816Z
Last WAL        262742
$

It would seem that the problem is related to the load balancer that fronts the Vault cluster. Thi is what I suspect.